Help answer this for me it will help i will give u extra points

Ascientist wants to use a model to present the results of his detailed scientific investigation. why would a model be useful? a )because the model makes the concepts easier to understand b) because the model is easy to put together and to use c) because the model prevents other scientists from asking questions d) because the model requires the audience to pay full attention to it i don't know what to choose because between a and d a is much more likely than d because it only wants to get the attention of the audience. i'm confuse.

An object in geometry with no width, length or height is a(n):

If each bricks costs and he can only buy one brick how much will it cost him to get the material to put around the outside of his garden?